black opal Directory References Discover Why Is Alcohol Measured by Proof? 9 Mind-Altering Plants 9 of the World’s Deadliest Mammals 6 Small Kingdoms of the World Was Martin Luther King, Jr., a Republican or a Democrat? 12 Greek Gods and Goddesses History of Technology Timeline Contents black opal mineral Ask the Chatbot a Question Ask the Chatbot a Question Learn about this topic in these articles:characteristics In opalBlack opal, with a very dark gray or blue to black body colour, is particularly rare and highly prized. White opal, with light body colours, and fire opal, characterized by yellow, orange, or red body colour, are much more common. Read More
